XenAPI: Upgrade built-VM to Trusty

If you're not using an XVA then the built-VM was previously Saucy, which is
not supported by openstack any more.

Change-Id: I1040d9e43d517582e76f2e1df787986b5ffbc42c
diff --git a/tools/xen/devstackubuntupreseed.cfg b/tools/xen/devstackubuntupreseed.cfg
index 6a1ae89..94e6e96 100644
--- a/tools/xen/devstackubuntupreseed.cfg
+++ b/tools/xen/devstackubuntupreseed.cfg
@@ -297,9 +297,9 @@
 ### Apt setup
 # You can choose to install restricted and universe software, or to install
 # software from the backports repository.
-#d-i apt-setup/restricted boolean true
-#d-i apt-setup/universe boolean true
-#d-i apt-setup/backports boolean true
+d-i apt-setup/restricted boolean true
+d-i apt-setup/universe boolean true
+d-i apt-setup/backports boolean true
 # Uncomment this if you don't want to use a network mirror.
 #d-i apt-setup/use_mirror boolean false
 # Select which update services to use; define the mirrors to be used.
@@ -366,7 +366,7 @@
 # With a few exceptions for unusual partitioning setups, GRUB 2 is now the
 # default. If you need GRUB Legacy for some particular reason, then
 # uncomment this:
-#d-i grub-installer/grub2_instead_of_grub_legacy boolean false
+d-i grub-installer/grub2_instead_of_grub_legacy boolean false
 
 # This is fairly safe to set, it makes grub install automatically to the MBR
 # if no other operating system is detected on the machine.